London · England · 77,282Boundary · 2023

Mitcham & Morden

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Dispatch
Apr 2026

A safe Lab seat, won with 55% of the vote in 2024. Centred on Merton. Population 125,842, notably young (median age 36 vs 41 nationally).

One of Labour's most active rebels on assisted dying, McDonagh voted against her party on multiple divisions during the Terminally Ill Adults (End of Life) Bill's Third Reading in June 2025 -- opposing the bill itself and two amendments she viewed as insufficient safeguards, while backing two tightening amendments the party majority rejected. Her position places her among the more cautious Labour voices on end-of-life legislation, and her voting profile shows she scores 22 percentage points above her party average on end-of-life autonomy concerns and notably higher on assisted dying safeguards. Beyond that flashpoint, she has voted loyally with the government on Crime and Policing Bill ping-pong votes, backing ministers in rejecting several Lords amendments including one that would have proscribed Iran's IRGC as a terrorist organisation.

A 28-year parliamentary veteran, McDonagh votes with Labour around 95.5% of the time but her participation rate of 59% sits below the Commons average -- meaning she attends roughly three in five votes. Her speeches, 142 contributions across 58 debates, concentrate heavily on health, economy and jobs, and social care. She departs from her party meaningfully on pro-local-democracy votes (17% versus a party average of 48%) and scores 0% on Lords scrutiny alignment, suggesting consistent support for executive authority over second-chamber checks.

287
Commons votes
This parliament
£32k
Median income
HMRC · 2024
77.3k
Electorate
2024 GE

Lab held for 5 consecutive elections.

Current Member of Parliament

Siobhain McDonagh

Siobhain McDonagh

Labour Party

Dame Siobhain McDonagh is the Labour MP for Mitcham and Morden, and has been an MP continually since 1 May 1997.

Notable Votes

Vote on whether to prevent someone from qualifying as 'terminally ill' under the assisted dying bill solely because they have voluntarily stopped eating and drinking. The amendment aimed to close a potential loophole where a person might use self-starvation to meet the terminal illness criteria they would not otherwise meet.

MP voted NoAgainst party majority

Vote on whether to prevent someone from qualifying as 'terminally ill' under the assisted dying bill solely because they have chosen to stop eating and drinking. The amendment would close a potential loophole where a person who is not otherwise terminally ill could meet the bill's eligibility criteria by voluntarily starving themselves.

MP voted YesAgainst party majority

A procedural vote on whether to allow New Clause 16 to be formally considered as part of the Terminally Ill Adults (End of Life) Bill at Report Stage, after proceedings had been interrupted on 13 June when an objection was raised. The debate excerpts do not reveal the substantive content of New Clause 16.

MP voted YesAgainst party majority

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Voting at a Glance

A safe Lab seat, won with 55% of the vote in 2024. Centred on Merton. Population 125,842, notably young (median age 36 vs 41 nationally).

2024 General Election

§ 06This week in Westminster.Live · today’s sittingOrder Paper · refreshed daily

McDonagh’s scheduled Commons activity this week — whipped divisions, oral questions, debates — drawn from the House of Commons Order Paper.

§ 07The record, at a glance.299 divisions voted

Two readings of the same data. Issue volume shows where McDonagh has cast the most ballots — a proxy for engagement, not direction. Notable votes are the moments where the whip was free or where they broke ranks.

Issue volume
Top issues by total divisions voted · cumulative this Parliament
Taxation
58
Economy
58
Employment
34
Crime & Policing
26
Welfare and Benefits
24
Education
23
Notable votes
Free votes and rebellions — moments the MP’s own judgment matters more than the whip
Terminally Ill Adults (End of Life) Bill: Amendment 9420 Jun 2025 · free vote
No
Terminally Ill Adults (End of Life) Bill: Amendment 2420 Jun 2025 · free vote
Aye
Terminally Ill Adults (End of Life) Bill: New Clause 1620 Jun 2025 · free vote
Aye
§ 08The local picture.11 wards

Constituencies are not uniform. Below — the local council make-up, key facts worth knowing, and the neighbouring seats on either side.

WardCouncillorVotesParty
Cannon HillJenifer Ann Gould1,329Liberal
Cannon HillMichael Charles Joseph Paterson1,193Conserva
Cannon HillNick McLean1,263Conserva
Colliers WoodCaroline M Cooper-Marbiah1,907Labour P
Colliers WoodLaxmi Attawar1,809Labour P
Colliers WoodStuart Neaverson1,563Labour P
Cricket GreenGill Manly1,816Labour P
Cricket GreenMichael Kevin Butcher1,788Labour P
Cricket GreenUsaama Kaweesa1,774Labour P
Figges MarshFranca Ofeimu2,529Labour P
GraveneyBilly Hayes2,009Labour P
GraveneyLinda Christine Kirby2,182Labour P
Population (2021 Census)
125,842
Electorate 77,282 · 2024 register
Median income
£31,500
HMRC SPI 2024
Households renting privately
27.4%
England average 20.0%
Schools
36
24 primary · 3 secondary
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